Xiaoli Jiang,Yan Zhang,Cheng Tang,Zehua Zhao,Wenqi Liu,Huandi Zhang,Jiale Song,Xiaowei Shi,Lei Li
Microsupercapacitors are important power suppliers for microelectronics, but their application is limited by low charge storage ability. Increasing the active material loading in the electrode can not only enhance charge storage ability but also increase the thickness of the electrode, which suffers from limited electrolyte ion diffusion. In this study, we design and print a 3D array-structured graphene/conductive carbon black electrode featuring tailored porosity and electrical conductivity via a self-sacrifice template of ethyl cellulose and carbon black. This structure design of electrode enhances active material sufficiency utilization with good electrode and electrolyte contact and facilitates electrolyte ion diffusion into the electrode. Their synergistic effect significantly improves the electrochemical performance of the microsupercapacitor, including a high areal capacitance of 35.75 mF cm–2, areal energy of 27.71 μWh cm–2, and power densities of 1.10 mW cm–2. A single device can power a pressure sensor for over 10,000 s, highlighting its remarkable potential for practical applications. This work would be beneficial for the development of microsupercapacitors.
Xiao Yu,Xinyi Zhang,Yongjian Lai,Donghai Wang,Yong Liu
3D electrodes have shown extraordinary promise for electrochemical energy storage devices in wearable electronics. However, it is still a significant challenge to rationally design 3D electrode that has the characteristics of lightweight, flexibility, low cost, high performance and miniaturization. In this work, we present a novel design of 3D electrode by directly growing the nanocrystalline TiO 2 film on carbonized eggshell membrane. The unique architecture can supply not only a continuous electron transport pathway through an interconnected carbon fibrous network but also an efficient electrolyte flux via an interpenetrating porous network. Besides, nanocrystalline TiO 2 film on carbonized eggshell membrane offers a short ion diffusion path in the solid-phase, leading to a rapid kinetic of electrochemical reaction. When tested as an anode for Li-ion battery, TiO 2 film in 3D electrode demonstrated excellent electrochemical performance with a large reversible capacity, excellent rate capacity and long life cycling property.
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